passant
Walking, usually to the right, and looking straight ahead with the right forepaw raised from the ground.
He them espying, gan himselfe prepare, / And on his arme addresse his goodly shield / That bore a Lion passant in a golden field.
Currently in use; in vogue.
obsolete
Many opinions are passant concerning the basilisk, or little king of serpents, commonly called the cockatrice [...].
Where it comes from
From Middle English passaunt (c. 1300), from Old French passant.
Adapted from the Wiktionary entry passant (CC BY-SA 4.0).